Does Chrome have built-in speech recognition for "x-webkit-speech" input elements?

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I'm wondering how

<input type="text" x-webkit-speech speech />

Is there a speech recognition enging built into Chrome or is it accessing an underlying speech recognition facility in the operating system?

Terrel answered 5/12, 2010 at 22:59 Comment(1)

Hacker News submission where you are probably found that link: news.ycombinator.com/item?id=1972855 – Alexio 5/12, 2010 at 23:11

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Yup, Chrome does speech recognition via Google's servers. But there's no reason that other browsers couldn't choose to implement it differently (for example using some speech recognition facility in the OS).

Balu, your link is actually a bit out of date. The latest Google proposal can be found here: http://www.w3.org/2005/Incubator/htmlspeech/2010/10/google-api-draft.html

Although speech recognition has been available in the Chrome dev channel for some time, it has not shipped yet and we're not yet sure when it will ship. We definitely want people to play with the API and offer feedback on it, but we don't think it's quite ready for prime time yet.

Existence answered 6/12, 2010 at 10:42 Comment(1)

There are serious privacy concerns here. – Obstinacy 31/12, 2011 at 8:46

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According to the code it sends the audio data as a POST request to:

https://www.google.com/speech-api/v1/recognize?client=chromium&lang=??&lm=??&xhw=??&maxresults=3

lm is grammar in the code, xhw is hardware_info which is optional according to a comment. The audio appears to be speex, x-speex-with-header-byte:

// Encode the frame and place the size of the frame as the first byte. This
// is the packet format for MIME type x-speex-with-header-byte.

It looks like it would be pretty trivial to modify the chrome code to use in your own app.

Update:

You also need to get a speech recognition API key and they are limited to 50 requests per day. There is no way to increase that limit - not even by paying.

Mobocracy answered 5/1, 2011 at 17:33 Comment(2)

Anyone know if Google are fine with this API being used directly by anyone, or if it's against terms & conditions? Thanks. – Micky 17/2, 2012 at 10:40

Does anybody know how "lm" (grammar) attribute works? W3C draft stated that grammar can be any URL to GRXML file but it doesn't change anything. – Ejaculatory 24/2, 2012 at 1:30

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They are using their own API for speech recognition. Ex: sending a post request to there servers.

Barny answered 6/12, 2010 at 0:3 Comment(0)

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There is an experimental fork of speexenc that can encode x-speex-with-header-byte MIME binary format, its referenced on the QXIP Wiki and is available on GitHub. Does the job fine by placing the size of the frame as the first byte of packets.

Depository answered 9/2, 2012 at 19:21 Comment(0)

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Speech recognition is a proposal by Google. https://docs.google.com/View?id=dcfg79pz_5dhnp23f5

The feature ships with Chrome 8+ and it looks like it sends the data to google servers to perform the actual recognition.

Alexio answered 5/12, 2010 at 23:29 Comment(0)

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This feature now works on chrome 11 beta.

check this out..

http://slides.html5rocks.com/#speech-input

Tier answered 24/3, 2011 at 7:16 Comment(0)

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This might be of interest https://github.com/taf2/speech2text ruby bindings for the google speech to text API

Bridgid answered 25/3, 2011 at 17:26 Comment(0)

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Yes, Chrome does have built-in speech support through WebKit; just look at the Google homepage (which now has a microphone to the right of the search box). I wonder, however, if the Chrome team is working on Omnibox speech support. After all, Chrome is a WebKit-based browser!

Musso answered 20/6, 2011 at 2:3 Comment(0)

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There is also a working group that produced http://www.w3.org/TR/xhtml+voice/ but I don't believe this is implemented in any browser except Opera.

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